My 2 cents
It's all good man, I don't play in any deep, never mind super deep dynasty leagues (all fpc & dfwc), but I own Johnson in redraft\bb and dynasty almost everywhere. What is not to like? He looked good in DET and in NY and up until recently he has been pretty much free. While other owners were taking Carter in the 6th-7th rds (dynasty & redraft) some of us have been taking Johnson in the 18-19th rds. Carter is a 4th rd pick who has trouble pass blocking (so better for dyn, but maybe not so much this yr imho) and Coleman is meh. Jets look like they will struggle on def and potentially be much better on offense now. I see a big neon sleeper sign flashing over Johnson. Even if it doesn't work out those who took a shot on him haven't lost much draft capital and can easily move on.
As far as Stevenson goes, he has looked good (im thinking Blount with hands) and I definitely like his dynasty prospects. However, at least for this yr he will likely need a Harris inj to become startable.